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stupidly I didn't take a screencap
In general, a screen cap doesn't do you much good in law, partly because you might have created it in photoshop but mostly because the terms on pretty much any web site will say that there's no contract until they have confirmed acceptance of your offer. This is something which goes back to before the internet to protect sellers from having to fulfil orders at a loss due to a printer's error
https://en.wikipedia.org/wiki/Errors_and_omissions_exceptedIf you got an email confirmation of your order, that's what counts and may form the basis of the contract, regardless of whether it exactly matches what was on the offer page or the web form you completed to initiate the purchase.
Is there a way to find a webpage archived in your browser/cookies as it was when you initially viewed it, it's not available on internet archive/wayback machine?
I bought something from a shop with a huuuuge discount and what turned up was a fraction of the order. After I raised the issue with them they changed the description (stupidly I didn't take a screencap) and since I raised a claim through paypal they've removed the photo.